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We report experimental investigation of spin-wave transport along combined magnonic structures which are comprised of the 90°-magnonic bend and adjacent nonidentical magnetic stripes. The latter has the form of a spin-wave coupler. Using space-resolved Brillouin light-scattering spectroscopy and micromagnetic simulations, we study propagation, transformation, and coupling of spin waves in the combined structure. We show that characteristics of spin-wave transport in such structures are defined strongly by the intermodal dipolar spin-wave coupling. The developed structure can operate as a multifunctional magnonic device and can be used to turn the spin wave at 90° performing the functionality of a directional coupler, a power splitter, a multiplexer, or a frequency separator. Our results show that interconnection of magnonic units can be utilized for further development of planar topologies of insulator-based magnonic networks.

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State-of-the-art studies of dielectric magnonics and magnon spintronics are reviewed. Theoretical and experimental approaches to exploring physical processes in and calculations of the parameters of magnonic micro- and nanostructures are described. We discuss the basic concepts of magnon spintronics, the underlying physical phenomena, and the prospects for applying magnon spintronics for data processing, transmission, and reception. Special attention is paid to the feasibility of boosting the operating frequencies of magnonic devices from the gigahertz to terahertz frequency range. We also discuss specific implementations of the component base of magnonics and ways to further develop it.